所有的声音都是通过振动发出；我们是通过喉咙中的声带振动而发出的，而弦拨吉他通过琴弦的振动发声。
All sounds are produced by vibrations; the sound of our voices is the result of vocal chords vibrating in our throats, while sound from a plucked guitar string comes from the vibrations of the string.
他花很多个小时听一根弦在不同背景下的振动——空心木，实心木，铝，钢。
He had spent hours listening to the vibration of a single string plucked against a variety of backgrounds-hollow wood, solid wood, aluminum, steel.
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